Electric-switch contact-holder.



PatenIed Jan. 16, 1917.

mmlw'" www@ A. P. WITTE.

ELECTRIC SWITCH CONTACT HOLDER.

APPucATmN min rss.x1.191s.

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UNITED sTATEs PATENT OFFICE.

IOLF Y. WITTE, OF CHICAGO, ILLINQIS, ASSIGNOR 0F ONE-HALF T0 MAURICE S. DICK,

` l 0F CHICAGO, ILLINOIS.

ELECTRIC-SWITCH CONTACT-HOLDER.

Specication of Letters Patent.

Patented Jan. 16, 1917.

Application tiled February I1, 191." Serial No. 77,731.

To all whom it may concern Be it known that I, AnoLr P. Wrrrn, a citi- 'zen fof the United States, and a resident of Ho ders, of which the followingis declared I,

to be a full, clear, and exact description.

This invention relatesV to electric switch contact holders, and its primary object is to rovide simple and improved means wherey the carbon contact block may easily and quickly be removed from its holder and replaced by a new one when worn out, or in case of breakage.

The invention has been designed particularly for use in connection with reverse switch mechanism of electricelevators, but it is to be understood that its use is not limited thereto as there are many situations where a carbon contact block holder-of the present type is capable of use.

his invention consists of the several novel features hereinafter fully set. forth and,

claimed.1

This invention is clearly illustrated in the accompanying drawing in which:

Figure 1, is a view partly in section and partly in side elevation of a' portion of an electric reversing switch, showing two carbon contact `block holders embodying "the resent invention, applied to said switch;

ig. 2, isY a cross section taken-on the line 2-2 of Fig. 1; Fig. 3, is an end view of the holder, loo ing in the direction of the arrow 3, in Fi 1; Fig. 4, is a perspective view of the hol er; Fig. 5, is a perspective view of Y thecarbon contact block used in connection with the holder; and Fig. 6, is a perspective View of a latch plate used with the holder.

In said drawing, the reference numeral A, desi ates a su port which may be composed of s ate or ot er non-conducting material, and 4tosaid support are secured carbon contactA block holders 11; there being as many hol ers as are necessaryfor the operation of the switch. In the drawing, two holders are sho vn, one on each -side of the support A, an below said holders is a rocking contact m ber 12, which has carbon contact blocks 13 u on its ends, 'that are adapted to be b ug t into contact with the carbon blocks 1 ,'for the pur ose of closing electrical circults; said roc ing contact member 12, is shown asmounted upon a shaft15, which i may be rocked by any suitable controlling mechanism, (not shown).

The contact block holding member comprises a fixed or stationary plate 16, having a stein 17, which projects up through a hole in the sup ort A, and is secured in place by a nut 18, t readed upon the end of the stem 17. The electric conductor cord a, may be secured in place between the nut 18, anda washer, as is customary. Slidablycarried by said plate 16, is a movable 'contact block holding plate 19, to which is secured two pins 20, that extend through holes in the fixed plate 16, and have headed ends 21, which strike against the plate 16, and limit the downward movement of the movable plate 19. Coiled compression springs 22, encircling the pins 20, are confined between the fixed plate 16, and movable plate 19, and act to yieldably -hold said movable plate away'from the fixedv plate. If desired, an electric conductor cord 23, ma be connected to the lates 16, 19', for ma ing electrical connection therebetween. The support A, is formed with holes 24, lying arallel with the hole for the stem 17, said lrioles 24, are intended for the reception of the headed pins 20.

The plate 19, is formed with a rectangular opening, or notch 25 (see Fig. 4) which extends back from one edge f the plate, and the carbon block 14, is f ined with .tv/o oppositely'disposed grooves 26, and a cross groove 261; that are adapted for the reception of the marginal edges 251, 252, of the notch 25. If desired, a rib 27,-'may be formed upon one face of the plate 19, to engage with one face of the carbon block. The carbon' block is fastened in place upon the plate 19, by bringing the grooves 26, in register wiii the edges 251,'of the opening, or notch, 25, andthen sliding the block back until it seats against the edge 252, of the opening or notch 25, after which itis prevented from'accidem tal removal by a latch plate 28, 4which is fastened in place across the gap in the plate. Said latch plate has a notch 29, in one end adapted for engagement with a headed pin 30, on the edge of the plate 16, and also has a transversely extending notch 31, near the other end adapted for engagement with a headed pin or lug 32, on the edge of the plate. When placing the latch on the plate 19, the notch 29, is first engaged with the lug 30, after which the latch is swung down to brin the notch 31, in engagementI with the lug` 32.

In. case a carbon block becomes worn or lugs 30, 32, the carbon block slipped oil' the plate 19, and a new carbon block inserted, after .which the latch may be re-'dttached to the lugs or pins 30, 32.

ore or less variation of the exactdetails of construction is possible without departing from the spirit of this invention, and I desire therefore, not to limit myself to the exI act construction shown and described, but intend in the following claims to point out all of the invention disclosed herein.

I claim as new and desire to secure by Letters Patent:

l. A carbon contact block holder, comprising a supporting plate, having a 'screw threaded stem, and arranged to be xedly secured to a support, a carbon contact block holding plate, having a rectangular notch extending in from one edge adapted to receive a grooved carbon block with the edges adjacent the notch of the notched l'plate entering the grooves of the carbon block, two

` headed notch formed therein and headed pins sliding in said apertures; the

pins secured to said blockholdingl plate, and slidably guided in apertures in said supporting plate;the heads of saidpins broken, the latch 28, is detached from the b enig arrangedto limit movement of said block holding plate inone direction, springs interposed between said plates, and a latch adapted to be secured to said block holding plate in frontof said notch, to thereby removably hold the block in place.

2. A carbon contact block holder, comprising a fixedy supporting plate, having a pair of apertures therein, a carbon block holding plate, having -an u aving a .pair of heads of said pins being arranged-.to strike against the supporting plate'to thereby limit movement of the block hol-ding plate in onedirection, springs .interposed between said plates, a grooved carbon contact .block removably held in the notch of'said block holding plate, and a latch removably secured to said holder above the block whereby the carbon block may be' removed without removal of the holder from its support.

A DOLF P. WITTE.

Wardly opening 

